[2] Matt Ridley reflects on Bitcoin – and on George Selgin’s reflections on the same: http://www.rationaloptimist.com/blog/the-bitcoin-bubble-and-birmingham-tokens.aspx

[3] George Will writes about Justin Amash, a U.S. Rep. from Michigan and one of the very few politicians for whom I have genuine respect: http://www.washingtonpost.com/opinions/george-will-justin-amash-one-to-watch-from-michigan/2013/04/19/4beebecc-a858-11e2-a8e2-5b98cb59187f_story.html

[6] here with classic help from Steve Landsburg: http://www.aei-ideas.org/2013/04/in-observance-of-the-green-religious-holiday-earth-day-the-science-of-economics-versus-the-religion-of-environmentalism/

[7] here with help from the superb economist Paul Rubin: http://www.aei-ideas.org/2013/04/more-reading-to-observe-the-green-holy-day-earth-day/

[8] Here is my 2009 attempt to help my then-sixth-grader son, Thomas, with his Earth Day assignment: http://cafehayek.com/2009/04/what-earth-day-means-to-me.html

[11] David Henderson shares with us a video of the great Shikha Dalmia speaking about unskilled immigrants: http://econlog.econlib.org/archives/2013/04/friday_night_vi_12.html

[12] But… but… but a handful of clever economists have theories for how a policy of artificially raising the cost of hiring young workers will help these young workers: http://www.ncpa.org/sub/dpd/index.php?Article_ID=23083&utm_source=newsletter&utm_medium=email&utm_campaign=DPD